package com.ynny.jdbc01;

import com.mysql.cj.jdbc.Driver;

import java.sql.*;

public class JDBCDemo03 {


    public static void main(String[] args) throws SQLException {

        Driver driver = new Driver();
        DriverManager.registerDriver(driver);
        String url = "jdbc:mysql://localhost:3306/db01";
        String userName = "root";
        String password = "root";
        Connection connection = DriverManager
                .getConnection(url, userName, password);

//        String param = "'喜羊羊'";
        //写sql
        //占位符 赋值
        String sql = "select * from book where name = ? and id = ?";
        //4.准备一个PreparedStatement对象 装载运输SQL语句到数据库中
        PreparedStatement preparedStatement =
                connection.prepareStatement(sql);
        //4.1给占位符赋值
        preparedStatement.setString(1,"喜羊羊");
        preparedStatement.setString(2,"2");

        //5.执行sql语句
        ResultSet resultSet = preparedStatement.executeQuery();
        //6.解析 ResultSet
        while (resultSet.next()){
            String id = resultSet.getString("id");
            String name = resultSet.getString("name");
            System.out.println(id + "\t" +name);
        }

        //7.关闭资源
        resultSet.close();
        preparedStatement.close();
        connection.close();



    }
}
